Machine for side-filing saws



(N0 Mode 1.) 2 Shets-Sheet 1.

' v J. W.-STOKOE.

MACHINE FOR SIDE FILING SAWS.

No. 468,476. Patentedf'eb. 9, 1892.

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(No Model.) 2 Sheets-Sheet 2.

J. W. ISTOKOE. MACHINE FOR SIDE FILING SAWS. No. 468,476. Patented Feb.9, 1892 1 3m [61' J WSMW 0,, wnmmumu, n. c.

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UNITED STATES PATENT OFFICE.

JOHN WV. STOKOE, OF JEANERETTE, LOUISIANA.

MACHINE FOR SIDE-FILING SAWS.

SPECIFICATION forming part of Letters Patent No. 468,476, dated February9, 1892. Application filed April 11, 1891- Serial No. 383,615. (Nomodel.)

To all whom it may concern.-

Be it known that I, JOHN W. SToKon, a citizen of the United States,residing at J eanerette, in the parish of Iberia and State of Louisiana,have invented a new and useful Machine for Side-Filing Band and otherSaws, of which the following is a specification.

This invention relates to machines for filing the sides of the teeth ofsaws; and it has for its object to provide a device of this class whichshall be simple in construction and effective in operation, and whichmay be read ily adapted to the frame of a machine of wellknownconstruction for grinding the cuttingfaoes of the teeth, thus reducingthe expense, inasmuch as certain parts of such machine may be utilizedto operate my invention.

The invention consists in the improved construction, arrangement, andcombination of parts which will be hereinafter f ullydescribed, andparticularly pointed out in the claims.

In the drawings hereto annexed, Figure 1 is a side elevation of a sawfiling machine constructed in accordance with my invention, showing thesame attached to the frame of a well-known saw-sharpening machine, partsof the latter having been shown in dotted lines and other parts omitted.Fig. 2 is a front elevation of the same.

Like numerals of reference indicate like parts in all the figures of thedrawings.

The numeral 1 designates the frame of a saw-sharpening machine of anywell-known construction adapted for grinding the cutting faces of theteeth to sharpen their cuttingedges. Such machine is shown in dottedlines in Fig. 2 and forms no part of the present invention. It may beomitted; but I preferably mount on its frame the herein-described1nachine comprising my invention.

Upon the frame 1 are suitably bolted brackets 2 2, havingvertically=sliding boxes 3 3, which are adjustable by means of thedoublethreaded bolts 4 and tightening-bolts 5, and which are providedwith bearings for the shaft 6, which may be vertically adjusted, whendesired, by means of the sliding boxes 3, carrying the same. The latteris provided near one of its ends with arms 6 and 6 having obliquelyarranged boxes 7, in which are mounted the spindles 8, the inner ends ofwhich carry the files or cutting-disks 9. The

extreme inner ends of the spindles 8 are also provided with pinions 10,meshing together, as shown, so that the files or cutters 0 shall operatesimultaneously.

The frame of the machine has a shaft 11, which is provided with a cam12, engaging a roller 13, mounted upon a lever 14:, which is suitablypivoted at one end to the frame of the machine. The other end of saidlever is connected with an arm 15 upon the shaft 6 by means of acompound connecting-rod composed of two parts 16, connected by a rightand left hand threaded nut 17 to enable the said compound connecting-rodto be lengthened or shortened, as may be found necessary, the saidconnecting-rods being adapted to intermittently cause the shaft 6 to beoscillated, and thus swing the files backward from the saw-tooth andupward at. the same time, thus allowing the files to slide over andrecede from the beveled surfaces of the teeth. It may also be readilynoted that the shaft 6, when desired, by means of the adjusting-bolt 4may be raised or-lowered to operate upon saws of different widths, thecompound rod 16 of course being lengthened or shortened to compensatefor the raising and lowering of the shaft. One of the arms 6 extendingfrom the shaft 6, has a bearing for the upper end of the shaft 18,provided with a beveled pinion 19, meshing with a pinion 20 upon theadjacent spindle 8. The lower end of the shaft 18 is likewise providedwith a beveled gear 21, adapted to be thrown into mesh with a beveledgear 22 upon the shaft 11, from which it receives motion. Motion is inthis manner transmitted to the spindles 8, which, being connected by thegear-wheels 10, will rotate in unison.

Suitably pivoted to the frame of the machine is a lever 23, having nearits upper end a vertically-swinging pawl 24: adapted to en gage theteeth of the saw which is being operated upon, and which is meanwhilesupported upon suitable brackets 25, bolted to the frame of the machine.The lower ends of the arms 6 and 6 are provided with setscrews 26,adapted to bear against the sides,

of the saw, and thus to guide the latter into position to be operatedupon. The lever 23, carrying the feed pawl 24, is connected with a crankor eccentric disk 27 upon the shaft ll by means of a compoundconnecting-rod 28, which may be adjusted by means of the right and lefthand threaded nut 29, by which its parts are connected.

The operation of this invention is as follows: When the shaft 11revolves and the cam 12 engages the roller on the lever 14, theconnecting-rod 16 will raise the arm 15 of the shaft 6, .thusoscillating the latter in its bearings and swinging the arms 6 and 6 ina backward and an upward direction, thus drawing and raising the filesor cutters at an angle from the saw which is being operated upon. At thesame time the lever 23, carrying the feed-pawl 24:, is moved in thedirection of the arrow, thus causing the pawl 24 to feed the saw forwardthe space of one tooth. hen the cam 12 passes from under the roller 13of lever 14, the latter descends, as do the arms 15, 6, and 6 of theshaft 6, thus carrying the files or cutters 9 back at the proper angleinto contact with the tooth of the saw which is to be operated upon.This operation is repeated, each tooth being successively operated uponuntil each tooth of the saw has been filed. It will be observed that thefiles or cutters occupy an oblique position with relation to each other,being thus adapted to file saw-teeth which are beveled upon oppositesides and in which the point of the saw-teeth is the widest. Large bandor similar saws cannot easily be operated upon by filing-machines ofordinary construction, the object being to preserve the bevel of thepoints of the saw-teeth, which is important for the purpose of keepingthe saws in good condition. This is effectively accomplished by myimproved 1riachine,which, as will be seen from the foregoing, isexceedingly simple and not liable to get out of order, while at the sametime its operation is altogether automatic.

In Fig. 1 of the drawings I have shown in dotted lines a modification ofmy invention, which consists in connecting with the arms 6 and 6 apivoted feed-pawl 30 of suitable construction. This pawl may, whendesired, be used as a substitute for the lever 23. The pawl 24 and theconnecting-rod 28 is likewise dispensed with when said pawl 30 is used.The construction formerly described is,-however, deemed preferable.

Having thus described my invention, I claim- 1. In a machine of theclass described, the combination of the main shaft having a cam, avertically-adjustable oscillating shaft havin ga radially-extendin garm, a compound conneoting-rod pivotally connecting said arm with alever pivoted to the frame and having a roller lying in the path of thecam upon the main shaft, and saw-filing mechanism connected to anddepending inwardly at an angle from one end of the vertically-adjustabeshaft, substantially as and for the purpose set forth.

2. The combination of a rock-shaft mounted in vertically-adjustableboxes or bearings, arms extending rearwardly from said rockshaft andhaving obliquely-arranged boxes or bearings, spindles mounted in thelatter and provided at their inner ends with miter-gears meshing witheach other and with suitable files or cutting-disks, suitable operatingmechanism for'the said file-carrying spindles, and

.mechanism for oscillating the rock-shaft to swing back and up thesaw-filing mechanism when the saw is to be fed forward, substantially asset forth. 1

3. In a machine of the class described, the combination of the mainshaft having a cam, avertically-adjustable shaft having aradially-extending .arm, a compound connectingrod pivotally connectingsaid arm with a lever pivoted to the frame and having a roller lying inthe path of the cam upon the main shaft, saw-filing mechanism connectedto one end of the vertically-adjustable shaft, a lever pivoted to theframe and having a feed-pawl at its upper end, and a compoundconnectingrod connecting said lever with a cam or eccentric upon themain shaft, substantially as set forth.

4.. The combination of a rock-shaft mounted ism when the saw is to befed forward, substantially as set forth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

JOHN \V 'STOKOE. Witnesses:

II. F. DUPEIRE, O. E. COLGIN.

